Carbureter.



S. L. PICARD.

CARBURETER.

APPLICATION FILED AUGJ. 1915.

l f Patentedsept. 4,1917.

Fmi.

9 l my a, a a @Zim sinner L. PICARD, or

DETROIT, MICHIGAN, ASSIG-NOR OF ONE-HALF TO ALFRED P. CHAMBE, OF DETROIT, MICHIGAN.

CARBURETER.

tessera.

Specification of Letters Patent. Y

Patented Sept.. 4L, 191'?.

Application mea-august 7, 1915. serial No. 44,218.

To all whom t may concern:

Be it known that I, SIDNEY L. PICARD, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, tain new and useful Improvements in Carbureters, jf which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to carbureters for use in connection with explosion engines, and more particularly designed to be used on motor vehicles.

In the construction of carbureters for motor vehicles it 'is customary to provide means for variably restricting or throttling the inlet of the carbureter to the cylinder of the engine, so as to regulate the force of explosion and the speed of the engine. It is also common with a certain type of carbureters to obtain a variation in the quantity of gasolene introduced into the mixing chamber by the variable suction produced by the operation of the throttle. .Thus under ordinary conditions, where the vehicles run upon a level road, the opening of the throttle will cause an increased quantity of gasolene to be drawn into the mixing chamber and absorbed by the large volume of air passing therethrough, while the closing of the throttle will correspondingly diminish the quantity of gasolene and air.

The means of re lation above, while opcretini satisfactori y under ordinary conditions, ave been found to beinadequate under other conditions, for example, when the vehicle is moving slowly under a large load, as where climbing a steep hill the maximum power of the en 'ne is desired, consequently the throttle is w1de open. At the same time on account of the slow movement of the iston, the suction produced is not great and requently results in the failureA to introduce sufficient gasolene in the mixing chamber to produce a proper explosive mixture.

Thus at a time where the greatest certainty of action is desirable there is the greatest likelihood of `failure in explosion. A It is one of the objects of the present invention toobtain a construction in'which a suiicient quantity of gasolene will always be drawn in the carbureting chamber, even where the movement of the piston is slow, and this is accomplished by a eculiar concton of autotic regulatmg valve or have invented cershutter for variably restricting the air conduit or passage contiguous to the gasolene discharge nozzle according to the suction produced by the engine and independentof the re lation of the throttle.

A. urther object of 'this invention is to provide a carbureter wherein the parts are constructed with a View of reducing the cost of manufacture and at the same time retain the features by which accuracy, durability, simplicity and ease of assembling are secured, and with such ends in view, my invention resides in the novel construction, combination and arrangement of parts to be hereinafter specifically described and then claimed.

. Reference will now be had to the drawing, whereinj Figure 1 is a vertical sectional view of a carbureter in accordance with my invention, an

Fig. 2 is an elevation of a portion of the same.

In a carbureter which embodies the leading characteristics of my invention, there is necessarily present a iioat chamber 1 having a gasolene inlet connection 2 from a suitable asolene supply tank, (not shown). In the oat chamber 1 is a needle valve' 3, actuated by a float 4 through the medium of pivoted arms 5 en aging a collar 6 on the needle valve 3, sa1d needle valve being capable of use as a priming device. rllhe construction just described is of conventional type and forms no part of my invention.

Connected to the float chamber 1 is a b ase 7 of the carburetor proper, said 'base havlng a bridge 8 provided wlth a port 9 in communication with the float chamber and with a bore 10 to receive a needle valve 11 which is of the ordinary and well known form and adapted to be manually adjusted. At the junction of the bore 10 and the port 9 there is a boss 12 affording a seat for a vertically dip-posed nozzle 13 having a gasolene outletcarbureting chamber 18 has a'conventional throttle 19 employed for controlling the supply of fuel to an engine equipped with a carbureter. v

Thebase 7 is provided with an annular seat and mounted on said seat around 'the nozzle 13 is a collar 20. This collar has the outer-walls thereof provided with apertured lugs 21 and pivotally connected to said lugs are semi-frusto conical shaped shutters 22. These shutters are in opposed relation and have lateral portions 23 resting normally upon the upper end of the collar 20 and the lugs 21 thereof. The shutters 22 restrict the air passage through the lower en of the carbureting chamber and the upper ends of said shutters arein proximity to the discharge orifice of the nozzle 13. The operation of these shutters is as follows: The discharge orifice of the nozzle 13 being not lower than lthe level of gasolene inthe ioat chamber, no discharge ensues when the engine is still. If the engine be started its -suction will draw Jf'uel through the nozzle 13 in proportion to the needs of the engine,

and, at the same time the air entering the elbow 15 is directed by the inclined shutters 22 against the end of the nozzle, thus insurin the complete and uniform carbureting o the air. Furthermore, the velocity of the air past the nozzle varies according to the speed of an automobile, thus, when more air is demanded, the shutters automatically open, thus increasing-:he area of the air inlet passage. It is t erefore apparent that the carburetting of the air varies 1n ratio to high and low spieeds, since at high speeds the air is not suc ed past the nozzle at an increased velocity which would decrease the thoroughness of mixing. The shutters 22 are simply automatic in their action and constitute a flexible choke which renders the carbureter highly eiicient and applicable to any engine.

It is thought that the operation and utility of my improvement will be apparent without further descri tion, and while in the drawing there isV 1 lustrated the preferred embodiment of my invention it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claim.

In a carbureter having a base and a gasolene discharge nozzle, a collar set in the base and provided with apertured lugs above the base, and opposing frusto-conical shaped shutters pivotally connected tothe apertured lugs of said collar and having lateral portions resting normally on the apertured lugs of said collar, said shutters having the upper ends thereof in proximity to the discharge orifice of'said nozzle and adapted to automatically restrict the passage around said nozzle.

In testimony whereof I alix my signature in presence of two witnesses.

SIDNEY L. PICARD. Witnesses:

ANNA M. Donn, G. E. MCGRANN. 

